EP2495458A1 - Gefräster Schraubenkopf für die Befestigung von Zubehörteilen und Eisenwaren an einer Metallwand - Google Patents

Gefräster Schraubenkopf für die Befestigung von Zubehörteilen und Eisenwaren an einer Metallwand Download PDF

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Publication number
EP2495458A1
EP2495458A1 EP20120157126 EP12157126A EP2495458A1 EP 2495458 A1 EP2495458 A1 EP 2495458A1 EP 20120157126 EP20120157126 EP 20120157126 EP 12157126 A EP12157126 A EP 12157126A EP 2495458 A1 EP2495458 A1 EP 2495458A1
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EP
European Patent Office
Prior art keywords
head
screw
thread
sub
countersunk
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP20120157126
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English (en)
French (fr)
Other versions
EP2495458B1 (de
Inventor
José Meireles
Emmanuel Demesmay
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SFS Intec SAS
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SFS Intec SAS
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Publication date
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Priority to PL12157126T priority Critical patent/PL2495458T3/pl
Publication of EP2495458A1 publication Critical patent/EP2495458A1/de
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Publication of EP2495458B1 publication Critical patent/EP2495458B1/de
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B35/00—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws
    • F16B35/04—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws with specially-shaped head or shaft in order to fix the bolt on or in an object
    • F16B35/06—Specially-shaped heads
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
    • F16B25/001—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by the material of the body into which the screw is screwed
    • F16B25/0021—Screws that cut thread in the body into which they are screwed, e.g. wood screws characterised by the material of the body into which the screw is screwed the material being metal, e.g. sheet-metal or aluminium
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B25/00—Screws that cut thread in the body into which they are screwed, e.g. wood screws
    • F16B25/10—Screws performing an additional function to thread-forming, e.g. drill screws or self-piercing screws
    • F16B25/103—Screws performing an additional function to thread-forming, e.g. drill screws or self-piercing screws by means of a drilling screw-point, i.e. with a cutting and material removing action

Definitions

  • the present invention relates to a countersunk head screw for attaching pre-drilled parts with a countersunk pilot hole on a thin metal wall, the screw having a conical sub-head connected to the screw shank with a thread, and the top the head having a fingerprint for taking a screwing tool.
  • Screws used in building hardware for fixing or in furniture for attaching an accessory to a metal wall are known. These screws are used in particular for fixing metal or plastic elements such as hinges, pommels, window rotation members on walls or metal profiles, such as an aluminum or steel window frame.
  • the parts to be fixed are pre-drilled.
  • the pre-drilling has, at the inlet, a countersink or pilot hole with a 90 ° angle to receive the head of a so-called countersunk head screw whose underside is conical and the flat top with a fingerprint for a screwdriver. But in general, these millings do not leave enough room in height to receive the screw head without it exceeds.
  • the screw head has a minimum height to contain the footprint used to take the screwing / unscrewing tool because the footprints such as cruciform impressions or Torx imprints, require a certain depth.
  • the screws have a metric pitch which is the one used generally in mechanics. But this step is too fine, that is to say that the pitch being small, it is necessary to screw several turns for the tightening in a wall even thin. This results in excessive screwing time.
  • the difference between the outer diameter of the thread and the diameter at the bottom of the thread is too small and does not allow a good catch between the thread of the screw and the thread of the bore, which gives a resistance to tearing.
  • the object of the present invention is to overcome the drawbacks of the known fastening screws and to develop a screw of the above type which makes it possible to fix an accessory effectively on a thin metal wall of less than 2 mm thick, with a good resistance to overthrow at the time of tightening and a head for accommodating an impression without the head protruding from the countersunk pilot hole of the part to be fixed.
  • This screw makes it possible to fix a piece of hardware or other parts provided with a pre-drilling with a conical pilot hole on a support constituted by a piece with a thin metal wall ensuring the firmness of the attachment of the part by screwing and avoiding that the screw does not constitute a troublesome asperity protruding from the surface of the room. This prevents the screw head from scratching a slippery or grazing the surface of the room around the location of the screw. As the thread comes directly to the sub-head level thanks to its 100 ° taper, the screw ensures that the thread remains engaged in the drilling of the thin metal wall.
  • the domed top of the head there is sufficient depth in the head to achieve the impression receiving the screwing tool while having the edge of the screw, that is to say the junction between the top and the sub-head located below the top point of the top so that the edge of the screw remains always below the part or plane passing through the opening of the milled pre-drilling even for a large inclination angle of the axis of the screw relative to the axis of the milled pre-drilling.
  • the junction between the sub-head and the shank of the screw comprises a transition formed of an intermediate cone with a taper of 40 ° and the threading continues with a thread going up on the intermediate cone up to the junction of the intermediate cone and the cone of the sub-head.
  • the intermediate cone between the threaded rod and the beginning of the conical sub-head makes it possible to raise the thread above and especially to create a rising thread which, because of the conicity of this part, is screwed with a corner effect in the thread cut in the thin wall of support by the thread of the threaded rod which precedes this upward thread.
  • the efficiency of screwing is all the better.
  • the pitch is equal to 1 mm.
  • the pitch of the thread is less than the thickness of the thin sheet that receives the thread.
  • This thin sheet has, in general, a thickness of the order of 2 mm or less, so that in all cases, the thread is hooked into the thickness of the hole made in the sheet.
  • the pitch is of the same order of magnitude as the thickness of the sheet, the thread of the screw has a sufficient relief to resist screwing and not to be damaged.
  • the pitch of the threading is equal to 1 mm.
  • the end of the threaded rod opposite the head is a self-drilling end. This allows screwing without pre-drilling.
  • the diameter of the head at the junction of the domed top and the conical sub-head is equal to 7.2 mm.
  • the subject of the invention is a countersunk screw for fixing pre-drilled parts provided with a countersunk pilot hole on a thin metal wall.
  • the screw 100 is composed of a head 110 with a conical underside or sub-head 112, a rod 120 provided with a self-tapping thread 121 and a self-drilling end 130.
  • the screw may not not have a self-drilling end and then screw in a pre-drilling.
  • the top 111 of the screw 100 is curved and has an imprint 114 for the gripping of a screwdriver such as a cruciform impression, a PZ impression, a Torx imprint, or other special imprints.
  • This cavity 114 is a cavity made in the screw head 110. The cavity being known, it is not shown.
  • the sub-head 112 is a 100 ° angle cone joined by a sub-head primer 115 and the rod 120 provided with the self-tapping thread 121.
  • the thread 121 has a pitch equal to a fraction of the thickness ( e) the thin metal wall (thin sheet) to which the workpiece is attached.
  • the thread 121 continues with a start of threading or upward threading 116 which arrives practically at the junction between the upper end of the rod 120 and the primer 115 of the conical sub-head 112. Indeed, the very flared conicity of 100 ° of the conical sub-head 112, allows the tool making the threading back on the rod 120 substantially until the junction of the rod 120 and the cone 112 of the head 110.
  • the shank 120 of the screw at the top of the thread 121 has an outside diameter of between 3.70 and 3.95 mm, and the trough 122 of the thread 121 has an inside diameter of between 2.70 and 2.95 mm.
  • the diameter of the periphery of the screw head 110 i.e. the edge 113 at the junction between the domed top 111 and the conical sub-head 112, has a diameter of 7.2 mm.
  • the figure 2 shows a second embodiment of a countersunk head screw 200 according to the invention, which is distinguished from the first embodiment by a conical shape constituted by an intermediate cone 215 connecting the conical underside or conical sub-head 212 to the rod 220.
  • This intermediate cone 215 with a taper of 40 ° is provided with a thread 216 which rises over the entire surface of the intermediate cone 215 to the junction of the intermediate cone 215 and the cone of the sub-head 212.
  • the top 211 of the head is curved and the junction between the top 211 and the conical bottom 212 form the edge 213 of the head 210.
  • the sub-head 212 has a taper of 100 °.
  • the other elements of this embodiment 200 are identical to those of the first embodiment 100.
  • the end may be a self-drilling end 230 or end with the thread 221 depending on whether the screw 200 is intended to pierce the support to which it is screwed or to pass in a pre-drilling made in it.
  • the thread 221 has a diameter similar or identical to that of the thread 121 of the screw 100 and the same is true of the hollow of the thread.
  • the figure 3 is a greatly enlarged scale view showing the position of the screw 200 (100) according to the invention connecting a part 300 to a support 350 constituted by a thin sheet and for comparison, a known screw 400 installed under the same conditions.
  • the screw 200 according to the invention shown corresponding to the second embodiment with a conical sub-head 212 and an intermediate cone 215 provided with the upward thread 216 and continuing the threading 221 of the rod 220.
  • the milled drilling 301 of the workpiece 300 to be fixed on the support 350 is a cone milled at an angle of 90 °; the head 210 of the screw according to the invention bears against the milled cone 301 on a substantially linear contact surface 302, corresponding to the intersection of the plane passing through the edge 213 of the head 210 and the milled cone 301.
  • linear contact 302 spreads in practice on a small peripheral band under the effect of the deformation of the surface of the cone 301.
  • This figure shows that the edge 213 of the head 210 remains below the surface 303 of the part 300 and only the rounded top of the domed top of the head appears on the surface.
  • the pitch of the thread 221 is sized to correspond to a fraction of the thickness (e) of the thin metal wall 350, there is necessarily a thread of the upward thread 216 or of the thread 221 of the rod 220, hooked into the sheet 350 traversed by the screw.
  • the conical and not cylindrical shape of the base of the thread that is to say the upward thread 216 on the intermediate cone 215, makes that the thread is forced into the tapped thread in the bore 351 by the passage of the thread 221 of the rod 220 of the screw 200.
  • the right part of the figure 3 the known countersunk bolt 400, 410 tapered at 90 ° and flat top 411, shows that this head is supported by the surface of the conical sub-head 412 in the countersunk countersunk surface 301 of the workpiece 300 and the edge 413 of the head 410 is level with the upper surface 303 of the piece 300, or slightly exceeds.
  • the head can exceed about 0.5 mm for a head at the bottom having a taper of 90 ° and this excess can reach 0.32 mm in the case of a known screw whose bottom has a taper of 80 ° .
  • the threading as it exists on the known screws 400 stopping on the rod 420 at a certain distance under the conical sub-head 412 of the head 410 practically does not bite not in the thickness of the fixing plate 350 and is limited to simply pinch this sheet.
  • the primer 415 of the rod 420 under the head 410 is a non-threaded area so that the unthreaded portion 415 under the lower surface 304 of the part 300, can represent between 0.66 and 0.76 mm.
  • the figure 4 is a partial view of the head 210 of the screw 200 according to the second embodiment compared to the head 410 of a known screw 400, the two screws being shown in identical positions and to the scale 5.
  • This comparative view shows the height H1 of the head 210 of the screw 200 according to the invention and that H 10 of the head 410 of the known screw.
  • the height H1 of the screw head 200 according to the invention is significantly reduced compared to that H 10 of the known screw 400.
  • the figure 5 is a comparative view of the screw 200 according to the invention and the known screw 400 to highlight the height of the thread starting measured from the top of the head.
  • the departure of the thread 216, 221 of the screw 200 according to the invention is above (height H2) of the start (height H20) of the thread 421 of the known screw 400, the top of the two heads being at the same level.
  • the figure 6 is a comparative view showing the establishment of a screw 100 according to the first embodiment of the invention and a known screw 400 in a countersunk hole 301 of a workpiece 300 to connect the workpiece to a sheet metal 350.
  • This figure highlights the position of the domed top 111 of the head 110 in the countersunk hole 301 of the workpiece; only the top of the domed top 111 of the head comes to the level, possibly exceeding the top 303 of the surface 300 of the part, while the head 410 of the known screw is level and its edge 413 may possibly protrude or form an edge vivid.
  • This comparative view also shows the attachment of the thread 121 of the screw according to the invention in the thin sheet 350, while the thread 421 of the known screw 400 is substantially out of the sheet 350 and is limited to pinching.
  • the figure 7 is a comparative view similar to the previous one showing the position of the screw 200 according to the second embodiment of the invention compared with the known screw 400.
  • the remarks made about the figure 6 also apply in this case.
  • this figure underlines the clamping effect achieved by the intermediate cone 215 and its thread 216 continuing the thread 121 of the rod 120 and coming to tighten by wedge effect in the through thread 351 cut by the thread 121 of the rod 120 in the thin sheet 350.
  • the thread 421 is virtually stopped under the passage 351 without being hooked or only on a very small fraction of a thread turn.
  • the figure 8 shows a particular case of positioning the screw 200 according to the invention and the known screw 400.
  • the edge 213 of the head 210 always touches the cone of the milled pilot hole 301 and does not protrude relative to the surface 303 of the part. In the case of the known screw 400, this situation is impossible.
  • the edge 413 of the head 410 inclined relative to the axis xx of the milled pilot hole 301 necessarily exceeds one side relative to the surface 303 of the part 300 and constitutes a troublesome asperity likely to scratch a part sliding or grazing the top 301 of the part 303 and screwed.
  • the figure 9 shows a known screw 400 for the same applications as that of the screw 100, 200 according to the invention.
  • This known screw 400 has a flat head 411 with a conical sub-head 412 of a 90 ° taper.
  • the diameter of the head 410 (413) is 8.1 mm.
  • the leading end of the shaft 420 is a self-drilling end 430. It can also be terminated simply by the threading and a point due to the threading tool.
  • the thread 421 stops far below the junction between the conical sub-head 412 and the shaft 420 of the screw 400.
  • Such a known screw is presented with or without a self-drilling tip with a thread corresponding to ISO 1478 is still called net "3.9".
  • the thread is 1.3 mm; the outer diameter of the thread 421 is between 3.79 and 3.91 mm and the inside diameter of the thread, that is to say at the bottom 420 of the thread, is between 2.77 and 2.92 mm.
  • the head 410 has a conical shape with a sub-head angle of 90 °. In rare cases, the heads are 80 °.
  • the other screw (not shown) used for this application has a metric thread according to the ISO 724 standard, also known as the M4 metric thread. Its pitch is 0.7 mm, the outside diameter of the net is between 3.9 and 4.1 mm and the inside diameter of the net, ie at the bottom of the net, is approximately 3.24 mm. mm. The head associated with this net, has a sub-head angle of 90 °.
  • the figure 10 shows a second example of known screw 400 'relatively rare. This has a top 410 'flat top 411' and a conical sub-head 412 'with a taper of 80 °. The diameter of the head 410 ', (413') is also 8.1 mm.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Connection Of Plates (AREA)
  • Golf Clubs (AREA)
EP12157126.9A 2011-03-03 2012-02-27 Gefräster Schraubenkopf für die Befestigung von Zubehörteilen und Eisenwaren an einer Metallwand Active EP2495458B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL12157126T PL2495458T3 (pl) 2011-03-03 2012-02-27 Wkręt z łbem stożkowym, do mocowania akcesoriów i artykułów metalowych na ścianie metalowej

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1151728A FR2972239B1 (fr) 2011-03-03 2011-03-03 Vis a tete fraisee pour la fixation d'accessoires et quincaillerie sur une paroi metallique

Publications (2)

Publication Number Publication Date
EP2495458A1 true EP2495458A1 (de) 2012-09-05
EP2495458B1 EP2495458B1 (de) 2015-10-14

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ID=45688157

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Application Number Title Priority Date Filing Date
EP12157126.9A Active EP2495458B1 (de) 2011-03-03 2012-02-27 Gefräster Schraubenkopf für die Befestigung von Zubehörteilen und Eisenwaren an einer Metallwand

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Country Link
EP (1) EP2495458B1 (de)
ES (1) ES2553077T3 (de)
FR (1) FR2972239B1 (de)
PL (1) PL2495458T3 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016016324A1 (en) 2014-08-01 2016-02-04 Hpt Sinergy S.R.L. Device for fixing a blank to a modular support system

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3894653A4 (de) * 2019-02-28 2022-10-12 IPH International Pty Ltd Eindringschutzschirm

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3313197A (en) * 1965-09-08 1967-04-11 Illinois Tool Works Screw
DE9210272U1 (de) * 1992-06-02 1992-10-08 Schüring GmbH & Co Fenstertechnologie KG, 5000 Köln Kreuzschlitzschraube für die Befestigung dünner Beschläge
DE9405595U1 (de) * 1994-04-02 1994-06-16 ITW Befestigungssysteme GmbH, 58642 Iserlohn Selbstbohrschraube für Fensterrahmen, Türrahmen o.dgl.
DE29617847U1 (de) * 1996-10-14 1996-11-28 Sfs Industrie Holding Ag, Heerbrugg Schraube zur Befestigung von Werkstücken

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3313197A (en) * 1965-09-08 1967-04-11 Illinois Tool Works Screw
DE9210272U1 (de) * 1992-06-02 1992-10-08 Schüring GmbH & Co Fenstertechnologie KG, 5000 Köln Kreuzschlitzschraube für die Befestigung dünner Beschläge
DE9405595U1 (de) * 1994-04-02 1994-06-16 ITW Befestigungssysteme GmbH, 58642 Iserlohn Selbstbohrschraube für Fensterrahmen, Türrahmen o.dgl.
DE29617847U1 (de) * 1996-10-14 1996-11-28 Sfs Industrie Holding Ag, Heerbrugg Schraube zur Befestigung von Werkstücken

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016016324A1 (en) 2014-08-01 2016-02-04 Hpt Sinergy S.R.L. Device for fixing a blank to a modular support system
EP3175125B1 (de) * 2014-08-01 2020-12-09 HPT Sinergy S.r.l. Vorrichtung zur befestigung eines rohling an einem modularen stützsystem

Also Published As

Publication number Publication date
FR2972239A1 (fr) 2012-09-07
ES2553077T3 (es) 2015-12-04
PL2495458T3 (pl) 2016-02-29
EP2495458B1 (de) 2015-10-14
FR2972239B1 (fr) 2013-04-12

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